Hubei Collaborative Innovation Center of Non-power Nuclear Technology, Hubei University of Science and Technology, Xianning, 437100, China.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China.
Environ Sci Pollut Res Int. 2020 Oct;27(30):38334-38343. doi: 10.1007/s11356-020-09789-8. Epub 2020 Jul 4.
A facile method to synthesize adsorbent based on cellulose modified by amino acid was developed. The novel L-cysteine-functionalized adsorbent for Au(III) recovery was synthesized via radiation grafting technique. Glycidyl methacrylate (GMA) was grafted on the surface of microcrystalline cellulose microsphere (MCC); next, ring-opening reaction was performed to immobilize L-cysteine. The adsorption abilities of the adsorbent (CysR) were tested. Batch experiments suggested that the maximum adsorption capacity of Au(III) is 714.28 mg/g calculated by Langmuir model. The adsorption kinetic data was followed by pseudo-second-order model. CysR showed excellent selectivity for Au(III) even the concentration of competing ions was all ten times than that of Au(III). The column experiments revealed that Au(III) could be efficiently adsorbed by CysR competition with equal amounts of Ni(II) and Zn(II). Moreover, XPS analysis demonstrated that the adsorbed Au(III) was reduced to Au(I) and Au(0). The adsorption performance certified that CysR was a promising adsorbent for Au(III) recovery.
开发了一种简便的方法，通过氨基酸改性制备纤维素基吸附剂。采用辐射接枝技术，合成了用于回收 Au(III) 的新型 L-半胱氨酸功能化吸附剂。通过接枝在微晶纤维素微球 (MCC) 表面接枝甲基丙烯酰氧乙基三甲基氯化铵 (GMA)；然后进行开环反应以固定 L-半胱氨酸。测试了吸附剂 (CysR) 的吸附能力。批量实验表明，根据 Langmuir 模型计算，Au(III)的最大吸附容量为 714.28mg/g。吸附动力学数据遵循拟二级模型。即使竞争离子的浓度均为 Au(III)的十倍，CysR 对 Au(III)仍表现出优异的选择性。柱实验表明，CysR 可与等量的 Ni(II)和 Zn(II)竞争有效地吸附 Au(III)。此外，XPS 分析表明，吸附的 Au(III)被还原为 Au(I)和 Au(0)。吸附性能证明 CysR 是一种有前途的 Au(III)回收吸附剂。
